package day20171020.test01;

public class Test01 {
    public static void main(String[] args) {
        UsbDiskWriter u1 = new UsbDiskWriter();
        u1.start();
        u1.stop();

        Camera c1 = new Camera();
        c1.start();
        c1.stop();

        Mobile m1 = new Mobile();
        m1.start();
        m1.stop();

    }
}
